Font Library: fix endpoint permissions

[matiasbenedetto]

It is necessary to fix the font library endpoints font permissions check.

Check the right folder

We need to check for write permissions in the right folder:
Currently, wp-content/upload/fonts/ is checked instead of wp/content/fonts.

Endpoints

• GET /fonts/collections/
• GET /fonts/collections/<id>/
  Should not check for write permissions on disk.

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• POST /fonts
  Should check for write permissions on disk only if any font families received have font faces defined with reference to files: downloadFromUrl or uploadedFile.
  Should return HTTP error code 403 if there are no permissions.

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• DELETE /fonts
  Should not check write permissions. The font asset will be try to be removed and if it fails it will return error for that particular font face.

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[madhusudhand]

Should check for write permissions on disk only if any font families received have font faces defined with reference to files: downloadFromUrl or uploadedFile.

@matiasbenedetto can you provide more details on the request payload scenarios. Are these downloadFromUrl or uploadedFile. (one of them) always present?